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岩体结构的表生改造是指河谷下切过程中 ,由于应力释放 ,岸坡岩体将向临空面方向发生卸荷回弹变形 ,谷坡应力场产生新的调整 ,伴随这一过程岩体结构所产生的一系列新的变异或变化。岩体结构的表生改造一般具有两类形式 ,即原有构造或原生结构面的进一步改造 ,或新的表生破裂体系的形成。其结果是在河谷岸坡一定深度范围内 ,形成类似于地下硐室围岩“松动圈”的岸坡卸荷带 ,从而恶化岩体的工程性状 ,降低结构面强度 ,对工程具有明显的影响和作用。该文采用有限元法模拟了某水电站坝区岩体结构的表生改造 ,探讨了地应力在表生改造中的作用 ,分析了表生改造对岩体结构的控制作用 ,为深入研究坝区岩体结构奠定了基础
The epiphytic alteration of the rock mass structure means that during the process of undercutting of the river valley, due to the release of stress, the rock mass of bank will unload and rebound deformation to the direction of free surface, and the stress field of valley slopes will be adjusted. With this process, A series of new variations or changes in the structure. In general, there are two types of superficial remodeling of the rock mass structure, that is, the further remodeling of the original or original structural plane or the formation of a new superficial rupture system. The result is a bank slope unloading belt similar to the “loose ring” of underground chambers in the depths of the river bank slope, which deteriorates the engineering properties of the rock mass and reduces the strength of the structural plane, which has a significant impact on the project And role. In this paper, the finite element method is used to simulate the alteration of the rock mass structure in the dam area of a hydropower station. The effect of the geostress on superficial remodeling is discussed. The control of superficial remodeling on the rock mass structure is analyzed. Rock structure laid the foundation